I had to dig my module out of the left rear access cover area. It was the outermost module, but to get to, to see the passkey I had to remove the spare tire cover and the plastic form on the left side to see the module. The module had a sticker and the four digit passkey was on that. Something like PK 1234. Then the standard paring instructions found here or on the BMW website should get you up and running.

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'06 X5 3.0l